Electrical Monitoring - Hitachi Relion 650 Series Technical Manual

1MRK 511 557-UEN Rev. A
Similarly, based on the changeover of NO and NC contacts, the mechanical moving time is evaluated
as the time gap between the instant of NC changeover and the instant of NO changeover as shown
in Table
Table 277: Derivation of the mechanical moving time for opening from NO and NC changeover timestamps
auxPosAvailable
None
NO only
NC only
NO and NC
where,
MMT= Measured mechanical moving time
t = Actual NC changeover time
NC
t = Actual NO changeover time
NO
12.18.7.11

Electrical monitoring

Based on the detection of electrical current interruption and inception, the ACBMSCBR function
provides the following electrical monitoring values at its outputs.
• Pre-strike angle and electrical making time
• Arcing time and electrical interruption time
• Re-strike/re-ignition detection and its count over operations.
Pre-strike angle and electrical making time (CB closing)
ACBMSCBR provides two sets of values each for pre-strike angle and electrical making time during
any close operation, namely the predicted and actual values of the operation. The predicted values
are published as soon as the close command is received on the CLCMDINP input, and the actual
values are published as soon asthe inception instant is detected. The predicted values are given at
the outputs PPRESTRAX, PELORTLX and PELORTCLX. The actual values are given at the outputs
APRESTRAX, AELORTMLX and AELORTCLX.
The predicted pre-strike angle PPRESTRAX (in degrees) is defined as:
PPRESTRAX = TGTANGLx + SCATTERLX
where SCATTERLX is the optimized offset from ideal target making instant. Refer
The predicted electrical making time PELORTCLX (in milliseconds) is defined as:
PELORTCLX = INPRICLLX – PPRESTRAX + CLOSECOMP + ADAPTCLLX
where PPRESTRAX is the expected pre-arcing time, CLOSECOMP is the total compensation value
for the mechanical closing time and ADAPTCLLX is the adaptive correction value for closing.
The same value is also given at the output PELORTLX for closing operations.
Refer Section 12.18.7.4
The actual electrical making time AELORTCLX (in milliseconds) is defined as:
AELORTCLX = Electrical Making Time
Refer Section
Technical Manual
277.
Mechanical moving time
0.0
0.0
0.0
MMT = t
and Section
12.18.7.10.1.
© 2021 Hitachi Energy. All rights reserved.
– t
NC NO
12.18.7.13.1.
Section 12
Monitoring
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Section 12.18.7.4.
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